vtkDataObjectImplicitBackendInterface.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause

#ifndef vtkDataObjectImplicitBackendInterface_h
#define vtkDataObjectImplicitBackendInterface_h

#include "vtkCommonDataModelModule.h"

#include "vtkAOSDataArrayTemplate.h"
#include "vtkDataArrayMeta.h"
#include "vtkSmartPointer.h" // for internal member
#include "vtkWeakPointer.h"  // for internal member

VTK_ABI_NAMESPACE_BEGIN

class vtkDataObject;
class vtkObject;

template <typename ValueType>
struct VTKCOMMONDATAMODEL_EXPORT vtkDataObjectImplicitBackendInterface
{
  vtkDataObjectImplicitBackendInterface(
    vtkDataObject* dataobject, const std::string& arrayName, int attributeType);

  virtual ~vtkDataObjectImplicitBackendInterface();

  ValueType operator()(vtkIdType idx) const;

protected:
  void OnDataObjectDeleted(vtkObject* caller, unsigned long eventId, void* calldata);

  virtual ValueType GetValueFromDataObject(vtkIdType idx) const = 0;

  vtkDataObject* GetDataObject() { return this->DataObject; }

private:
  vtkDataArray* GetArray();

  vtkWeakPointer<vtkDataObject> DataObject;

  vtkSmartPointer<vtkAOSDataArrayTemplate<ValueType>> Cache;
  std::string ArrayName;
  int AttributeType;
};

VTK_ABI_NAMESPACE_END
#endif

#if defined(VTK_DATAOBJECT_BACKEND_INSTANTIATING)

#define VTK_INSTANTIATE_DATAOBJECT_BACKEND(ValueType)                                              \
  VTK_ABI_NAMESPACE_BEGIN                                                                          \
  template struct VTKCOMMONDATAMODEL_EXPORT vtkDataObjectImplicitBackendInterface<ValueType>;      \
  VTK_ABI_NAMESPACE_END

#elif defined(VTK_USE_EXTERN_TEMPLATE)

#ifndef VTK_DATAOBJECT_BACKEND_TEMPLATE_EXTERN
#define VTK_DATAOBJECT_BACKEND_TEMPLATE_EXTERN
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable : 4910) // extern and dllexport incompatible
#endif
VTK_ABI_NAMESPACE_BEGIN
vtkExternTemplateMacro(
  extern template struct VTKCOMMONDATAMODEL_EXPORT vtkDataObjectImplicitBackendInterface);
VTK_ABI_NAMESPACE_END
#ifdef _MSC_VER
#pragma warning(pop)
#endif
#endif // VTK_DATAOBJECT_IMPLICIT_BACKEND_TEMPLATE_EXTERN

#endif